Method for assisting in the landing of an aircraft

A method for assisting in the landing of an aircraft that includes an on-board system, on a landing zone associated with a ground system, said ground system comprising several communication sub-modules each comprising an antenna, the on-board system and the ground system being able to communicate together, the method being characterised in that it comprises the steps consisting of:

• during a first landing phase, synchronising the on-board system and the ground system by exchanging at least one item of timestamp information between the ground system and the on-board system,
• during a second landing phase, after the first landing phase:
• first point:
• estimating for each sub-module at least one item of information characteristic of the distance separating the aircraft from the relevant sub-module, and combining the information in order to infer therefrom at least one item of information characteristic of the raw general direction of arrival of the aircraft relative to a given point of the landing zone,
• second point:
• estimating at least one item of information characteristic of the direction of a signal transmitted by the aircraft with respect to the ground system,
• third point:
• comparing the item of information characteristic of the raw general direction of arrival of the aircraft established at the first point with at least the item of information characteristic of the direction of the second point, and determining at least one item of information characteristic of the refined general direction of arrival of the aircraft with respect to the given point in the landing zone,
• fourth point:
• guiding the aircraft on the basis of said item of information characteristic of the refined general direction of arrival of the aircraft with respect to the given point of the landing zone. of information is that of a reference clock.